Guard for grinding wheels



May 5; 1925.

E. L. CONNELL GUARD FOR GRINDING WHEELS Filed April 15, 1922 Edwin Z.60102611,

Patented May 5, 1925.

. .UNITED STATES PATENT, OFFICE;

nnwm L. cour ers, or CLEVELAND, o -iIo, assrenon TO THE van DonnELECTRIC TOOL GQl'ltIANY, or cnnvnnann, OHIO, A CORPORATION or 01110.

GUARD FOR GRINDING WHEELS.

Application filed. April 15, 1922. "serial in. 552,027.

To all whom it may concern:

Be it known that I, EDWIN L. CoNNnLL, a citizen of the United States ofAmerica, residing at Cleveland, in the county of Cuyahoga and State ofOhio, have invented certain new and useful Improvements in GuardsforGrinding \Vheels, of which the following is a specification.

My invention relates to improvements in guards for grinding wheels, andhas for its object the provision of a simple and adjustable unitaryguard for the periphery al'ldsides of emery wheels and the like.

Users of grinding wheels commonly are required to comply with theprovisions demanding the protectionof the operative by means of aperipheral guard which shall be adjustable as the wheel wears away.Moreover, it is a common requirement that the shaft end or side of theemery wheel, which normally is exposed, shall be bored or suitablyprotected.

Accordingly, I have sought to provide the simplest unitary means wherebythese fea tures of protection are afforded in a cheap, simple andadjustable guard.

The details of construction and further advantages may best be explainedby making reference to the accompanying drawings, wherein Figure 1 is aView in side elevatioi'l. of a 3 t: ments are applied,

Fig. an a front elevation of said mechanism partially broken away, andFig. 3 is a small elevation.

'lhrOughout the drawings I have employed the same character of referenceto indicate theshowing of identical parts.

self-contained grinding mechanism, comprising an electric motor a and,preferably, two syn'nnetrically positioned, counterbalancing wheels Z)of emery, carborundum or the like, are shown in the drawings for thepurpose of explaining my improvements as applied thereto.

A. fixed peripheral wheel. casing 0 is shown positioned at the left ofthe motor foraccommodating the grinding wheel I); this casing being openat the front and side. An adjustable supportalfor the article beingground is positioned upon a bracket (2 carried by the lower portion ofthe motor casing.

An adjustable guard e,

rinding mechanism to which my in'iprove termediate boxing c terminallyslotted at c, is mountednpon casing 0 by means of thumb-nuts 6'. Thisguard comprises an in adapted to accommodate the securing nut a" at theend of the motor shaft, and the angularly extending peripheral guard 7adapted to form a barrier at the top of the grinding wheel.

Thus the adjustable guard comprises a suitable boxing for the exposedface of the wheel as well an adjustable barrier which may be positionedat successively lower levels to conform with the periphery of'saidgrinding wheel as 1t wears away with use. However, thediametricall ypositioned guard a, while in'mriably n'otecting the end of the shaftmounting the grinding wheel, leaves the side of the wheel exposed forlateral grinding thereon. Moreover, as the guard e and the transverselyextending peripheralguard f are integrally formed, there isno chancethat one of these members may be forgotten or accidentally displacedwhen adjustments are required.

It is obvious that these parts may be dif ferently proportioned andmounted, but the adjustable guard preferably combines the protectivefeatures for the periphery and shaft or mounting of the grinding wheelalong the general lines above explained, con-- formable with myinvention.

Having now described the advantages and structural details pertaining tomy invention, 1 claim new and desire to secure by Letters Patent, thefollowing: i

1.. The con'ibination with. a grinding'wheel,

of a main guard casing conforming to and nesting over a greater portionof the periphery of said grinding wheel and exposing a portion of saidwheel for grinding purposes, a supplemental guard support upon the endof said main guard and including means for guiding it radially withrespect to said wheel, a laterally extending guard plate carried by saidsupplemental guard support and extending toward the wheel at the end ofthe main guard, and means for clamping said supplemental guard supportin any adjusted position.

2. The combination with a grinding wheel shaft, a wheel and a nut forholding said wheel upon the shaft of a main guard nesting about theperiphery of the greater portion of said wheel, and a nut guard memberin the form of a strap removably secu red to the main guard or oppositesides of said nut.

The combination with a grinding device, comprising a shaft, a wheel anda nut for holding said wheel upon said shaft, of a main guard nestingabout a portion of the periphery of said wheel, a supplemental guard forone end of said main guard and comprising a solid strap extendingdiametrically across the main guard and over said nut, means forclamping said strap in place, and a supplemental guard plate carried bysaid strap and adapted for movement along the end of the main guardtoward and from the periphery of the wheel as it wears.

4-. The combination with a grinding device comprising a shaft, a wheeland a nut for holding said wheel upon said shaft, of a main guardnesting about a portion of the periphery of said wheel, a supplementalguard extending along one side of said wheel and over said nut, and asupplen'iental guard plate carried by said supplemental guard andadapted for movement toward and from the periphery of said grindingwheel.

In testimony whereof I do now atlix my signature.

EDXVIN L. CONNELL.

